EP3727825A1 - Method for placing a reinforcing ply on a large dimension drum - Google Patents

Method for placing a reinforcing ply on a large dimension drum

Info

Publication number
EP3727825A1
EP3727825A1 EP18822036.2A EP18822036A EP3727825A1 EP 3727825 A1 EP3727825 A1 EP 3727825A1 EP 18822036 A EP18822036 A EP 18822036A EP 3727825 A1 EP3727825 A1 EP 3727825A1
Authority
EP
European Patent Office
Prior art keywords
cylindrical shape
web
edge
cutting blade
cutting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18822036.2A
Other languages
German (de)
French (fr)
Other versions
EP3727825B1 (en
Inventor
Stéphane Barjon
Michel GAYTON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Generale des Etablissements Michelin SCA
Original Assignee
Compagnie Generale des Etablissements Michelin SCA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compagnie Generale des Etablissements Michelin SCA filed Critical Compagnie Generale des Etablissements Michelin SCA
Publication of EP3727825A1 publication Critical patent/EP3727825A1/en
Application granted granted Critical
Publication of EP3727825B1 publication Critical patent/EP3727825B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D30/46—Cutting textile inserts to required shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/30—Applying the layers; Guiding or stretching the layers during application
    • B29D30/3007—Applying the layers; Guiding or stretching the layers during application by feeding a sheet perpendicular to the drum axis and joining the ends to form an annular element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D30/46—Cutting textile inserts to required shape
    • B29D2030/466—Cutting the textile inserts between cords

Definitions

  • the invention relates to a method of producing a tire comprising a step during which is deposited by winding a reinforcing ply on a cylindrical shape.
  • This method is concerned with the case of large tires such as civil engineering tires, whose seat diameter can be up to 63 inches and whose mass can be several tons.
  • the method according to the invention relates more particularly to the laying of reinforcing plies intended to consolidate the crown of the tire.
  • These sheets are formed of sections of son embedded in a rubber mixture, parallel to each other and at a given angle with the longitudinal direction of the sheet.
  • These son are generally metal son themselves formed of the assembly of several layers of son wound on themselves.
  • the reinforcement plies are taken from a continuous strip and are placed on a receiving surface such as a substantially cylindrical shape formed of radially movable sectors or directly on the top of the envelope after a so-called conformation step during of which the tire blank is given its toric shape.
  • the method according to the invention aims to provide a solution to the problems posed above.
  • Step A a front edge of the reinforcing ply is adhered to the cylindrical shape and, by rotating the cylindrical shape in a first circumferential direction, the ply is deposited on the cylindrical shape until the front edge makes a full turn,
  • Stage B a point of penetration on a cutting line is marked on the sheet to form a trailing edge intended to be joined with the front edge
  • Stage C A cutting blade is fitted to a cutting head driven in translation along a transverse axis, between two son placed on the cutting line at said point of penetration and defining a cross-piece,
  • Step D The cylindrical shape is rotated in a second circumferential direction, opposite the first circumferential direction, by moving the cutting head in a first transverse direction until the cutting blade is disposed at a predetermined distance and not at a predetermined distance. zero of a first selvedge and, without coming out the cutting blade of the interlock,
  • Step E The cylindrical shape is rotated in the first circumferential direction, moving the cutting head in a second transverse direction, opposite to the first transverse direction until the cutting blade opens at a second selvedge ,
  • Step F the cylindrical shape is rotated in the second circumferential direction and the rear edge is adhered to the cylindrical shape by putting the front and the front edge end to end,
  • Step G detach the rear edge of the web at the first edge and complete the jointing of the trailing edge and the front edge.
  • the cutting length of the web can be done without it being necessary to extract the cutting blade of the interlocking defined by the space between the two son forming the selvedges of the rear edge of the web being laid and the front edge of the remainder of the continuous web.
  • This feature of the method eliminates the need to reinsert the blade between the two son and is difficult to achieve using automated means. It also allows the possibility, as will be seen later, to perform most cutting operations using motorized means controllable by a centralized control unit to relieve and reduce to just the necessary manual interventions of the 'operator.
  • this method allows cutting along long edges of up to 5m long. It finally makes it possible to reduce the forces imposed on the operator to take off the sheet and adjust the jointing of the selvedge before and the selvedge back.
  • the method according to the invention may also comprise in isolation, or in combination, the execution of the following actions:
  • step B an operator determines the penetration point and affixes a visible mark thereon.
  • step C using a camera disposed on the cutting head, the mark placed on the point of penetration is detected, and the rotation of the cylindrical shape and the transverse displacement of the head of the cylinder are controlled. cutting to bring said cutting blade to the right of said point of penetration.
  • step B the front edge is detected by means of a front detection device sensitive to the variation of height generated on the cylindrical shape by the passage of said front edge to the right of said front detection device. , and the cylindrical shape and the cutting blade are brought to predetermined angular and transverse positions so that, in step C, the cutting blade enters between two wires at the point of penetration on the line of chopped off.
  • the transverse position of the cutting blade is aligned with the position of the edge detection device.
  • the edge detection device is disposed transversely equidistant from the first and second edges.
  • the transverse displacement of the cutting head is regulated as a function of the longitudinal displacement of the laying belt and the angle formed by the wires with the longitudinal direction.
  • the cutting blade is freely movable in a direction transverse to the cutting head.
  • the transverse displacement of the cutting head is adjusted so that the transverse position of the cutting blade by ratio to the cutting head remains within predetermined limits.
  • the web is circulated successively on a centering mat and then on a laying mat disposed upstream of the cylindrical shape.
  • the centering belt is rotatable about an axis perpendicular to the plane of the centering belt on which the lap and, using cameras detecting the position of the selvedges of the web, the angular position of the belt of the web is regulated. centering so as to align the web to a predefined transverse position.
  • the threads of the tablecloth are metal threads, and the centering mat and the carpet of laying are provided with a magnetic device for adhering the sheet on said mats.
  • the planes of the laying mat and the centering mat on which circulates the sheet do between them a non-zero angle.
  • a driving force supplied to the web by the centering belt is less than or equal to half of a driving force supplied to the web by the laying mat.
  • the longitudinal speed of the laying belt and the centering belt is adjusted with respect to the rotation speed of the cylindrical shape so that the laying tension of the lap on the cylindrical shape is equal to a predetermined value.
  • step G the rear edge of the sheet is detached by means of manual tools.
  • the cylindrical shape is formed of radially movable sectors.
  • the cylindrical shape is the top of a tire tire blank.
  • FIG. 1 represents a schematic perspective view of an assembly machine for producing the crown of a civil engineering tire.
  • Figure 2 shows a schematic top view of a reinforcing ply.
  • Figure 3 shows a schematic top view of the centering device and laying.
  • Figures 4, 5 and 6 show simplified schematic side views of the laying mat and the centering mat during the implementation of the method.
  • Fig. 7 shows a schematic side view of the voltage regulating device.
  • Figure 8 shows a schematic perspective view of the cutting head.
  • Figure 9 shows a schematic front view of the tip of the cutting blade.
  • Figure 10 shows a schematic front view of the web in step B.
  • FIG. 11 represents a schematic front view of the web during step D or step E.
  • Figures 12 and 13 show schematic side views of the device front edge detection.
  • the pins in which the longitudinal direction XX 'corresponds to the direction of flow of the web and the circumferential direction of laying.
  • the manufacturing machine illustrated in Figure 1 allows to locate the main organs used in the implementation of the method.
  • the cylindrical shape 1, formed of radially circumferentially circumferentially distributed sectors, is rotated about its axis by a motor 10.
  • An encoder (not shown) allows to know at any time the angular position of the cylindrical shape and that the speed of rotation of the cylindrical form 1.
  • a motorized unwinder 7 is disposed upstream of the installation to provide on demand the tape length necessary to take a reinforcing ply P for forming the top of the tire casing.
  • a first feed belt 4 directs the belt downstream of the machine.
  • This feed belt 4 may be a motorized training mat or a ball table allowing lateral movement of the band.
  • Mechanical pre-centering means such as adjustable guides, then allow the band to be placed laterally in a first set of tolerances.
  • a centering belt 3 is disposed downstream of the feed belt 4, and upstream of a laying belt 2.
  • the centering belt 3 and the laying belt 4 are provided with a magnetic system. , known per se, for adhering the web and maintain it in position throughout the process of transfer of the web on the mats 2 and 3.
  • transfer arms or magnetic mats can be placed between the mats to ensure the passage of the tip of the web from one carpet to another.
  • the uncoiling or winding device 7, the feed belt 4, the centering belt 3 and the laying belt 2 are controlled by a centralized control unit which actuates the drive means of the mats to make advance or retreat the web at a longitudinal speed synchronized with the angular velocity of the cylindrical form 1.
  • the laying belt 2, the centering belt 3, the feed belt 4 and the unrolling device 7 are actuated in a first longitudinal direction corresponding to the unwinding and at feeding a continuous band.
  • the cylindrical shape 1 is rotated in the second circumferential direction these bodies operate in a second longitudinal direction opposite to the first longitudinal direction and the device 7 is then configured to rewind the band.
  • a cutting device 5 also controlled by the centralized control unit is disposed downstream of the laying belt 2 between a voltage regulating roller 6 and the output of the laying mat.
  • the cutting device 5 comprises a cutting head 51 running on a rail 50 arranged transversely.
  • a reflector 52 is placed behind the web.
  • the voltage regulating roller 6 is disposed downstream of the cutting device 5 near the point of contact between the sheet and the cylindrical shape 1.
  • FIG. 2 shows a reinforcing ply P, once detached from the continuous strip, in which there is a first edge Li and a second edge L 2. These lateral edges are parallel to each other and are distant from each other. other, in the case of a sheet intended for a civil engineering tire, with a width varying from 150 millimeters to more than one meter.
  • the reinforcing ply has a thickness that can vary from 3mm to 10mm.
  • the son making up the reinforcement ply have a diameter ranging from 1 mm to 6 mm and the pitch between the son varies, depending on the type of ply, from 2 mm to 7 mm.
  • the front edge PF comprises a front tip PFi a front heel PF 3 and a front center PF 2 located on the intersection of the equidistant line of the two edges Li and L 2 with the line forming the front edge.
  • the rear edge PR comprises a rear tip PRi, a rear heel PR 3 and a rear center PR 2 .
  • the son of the ply are given an angle with the longitudinal direction XX 'between 0 ° and 60 °.
  • the width and angle values indicated above lead to obtaining a sheet front whose length varies from 300 mm to more than 5m.
  • Figure 3 illustrates the operation of the dynamic centering device.
  • the centering belt 3 shown in FIG. 3 is rotatably mounted about an axis 30 perpendicular to the plane of the centering belt 3.
  • An actuating cylinder 32 makes it possible to control the angular position of the centering belt with respect to the direction longitudinal XX '.
  • Cameras 31 disposed on either side of the web between the centering belt 3 and the laying belt 2, detect the position of the edges Li and L 2 with respect to a centering axis.
  • This centering axis may be aligned on an equatorial line of the cylindrical shape or shifted laterally depending on the type of sheet to be laid.
  • the information concerning the positioning of the selvedges obtained by the cameras 31 is transmitted to the centralized control unit which controls the position of the jack 32 to modify the lateral position of the sheet so that the sheet penetrates the mat of poses 2 being perfectly aligned with the centering axis.
  • Figures 4, 5 and 6 illustrate a particular implementation of the peeling process related to the thick layer of the web.
  • the laying mat 2 When, at the time of laying the sheet, the laying mat 2 is lowered in the direction of the cylindrical shape 1, the plane of the laying mat 2 makes a non-zero angle ⁇ with the plane of the centering mat 3 The web then travels on the cylindrical portion of the drive roller 21 disposed on the upstream side of the laying mat.
  • the circumferential speed of the web depends on the distance to the center of rotation of the roller 21.
  • the portion of the web in contact with the cylindrical portion will have a circumferential movement speed equal to the product of the angular velocity of the roller 21 by the radius r.
  • the circumferential speed of the neutral fiber of the ply will be equal to the product of the angular velocity of the roller 21 by the radius r increased by the half thickness of the ply P.
  • FIG. 7 illustrates the operation of the voltage regulation device comprising a dynamometric roller 6 around which the reinforcing ply flows when the laying mat 2 is in the low position. After calibration, the radial force exerted by the ply on the roller 6 allows to estimate the laying tension.
  • a regulating device connected to the centralized control unit, then acts on the speed of the belts 2, 3 and 4 to maintain the laying tension to a predetermined value.
  • a first control loop "blind” synchronizes the speed of the carpet on the angular velocity of the cylindrical shape.
  • the tangential velocity at the point of contact between the ply and the surface of the cylindrical shape can experience significant variations related to the non-control of the diameter of the cylindrical shape, and to the presence profiles previously laid.
  • the regulation of the voltage around a setpoint which can vary between 100N and 300N is superimposed on the first control loop and makes it possible to overcome these uncertainties.
  • the voltage regulation device can be activated regardless of the circumferential direction imposed on the cylindrical shape 1.
  • Figures 8 and 9 show a more detailed view of the cutting head 51 mounted by means of a support arm 515 on a carriage (not visible) sliding on the transverse rail 50.
  • the cut of the tablecloth is performed by moving the web in the longitudinal direction XX 'and moving the carriage supporting the cutting head 51 in the transverse direction YY'.
  • the ratio of the transverse displacement of the cutting head 51 and the longitudinal displacement of the ply P is equal to the tangent of the angle formed by the threads of the ply with the longitudinal direction.
  • the cutting head 51 comprises a body 512 supporting a cutting blade 513.
  • a motorized device (not visible) allows to actuate the cutting blade in the direction ZZ 'to penetrate the blade in the interstice formed by the section line L.
  • the tip of the blade 513 is provided with a spherical element 514 for guiding the blade between two reinforcing son W, as shown in Figure 9.
  • the diameter of the spherical element is usefully of the order of 4mm.
  • a heater keeps the cutting blade 513 at a controlled temperature of the order of 60 ° C.
  • An anvil (not shown) can be approached from the back of the web to the right of the point of penetration of the cutting blade, to facilitate the penetration of the blade into the web.
  • the cutting blade 514 has two sharp cutting son opposed to each other so as to allow cutting of the web regardless of the direction of flow of the cutting blade in the interlacing.
  • the cutting blade 513 is free to move in the transverse direction YY 'relative to the body 512. This movement is between two limits distant from a value d.
  • a sensor 516 such as a laser makes it possible to evaluate the lateral position of the blade within this clearance, the value of which is of the order of one centimeter. It is observed in fact that the angle formed by the son along the section line is not strictly constant and the blade can be offset laterally in one direction or another.
  • a return spring (not visible), low taring, allows to bring the blade back to the zero point when the blade is out of the interlock.
  • the sensor 516 sends a signal to the centralized control unit which controls the movement of the carriage running on the rail 50 and supporting the cutting head for replace the blade within the limits in which the deflection remains free.
  • Cells 511 placed on both sides of the body 512 of the cutting head to evaluate the position of the blade relative to the first edge Li or the second edge L 2 .
  • the light reflected by the reflector 52 is detected by the cells 511, and a signal is sent to the centralized control unit.
  • a first step A the strip is unfolded to present the front edge on the cylindrical shape 1.
  • the operator adheres the tip of the front edge PF to the cylindrical shape 1 and initiates the rotation of the cylindrical shape in a first circumferential direction, to deposit the sheet on the cylindrical shape until the front edge PF realizes substantially a complete turn.
  • the next step B begins when the front edge PF is again in front of the operator. During this step B is marked on the web a penetration point on a section line L to form a rear edge PR to be joined with the front edge PF.
  • a first alternative is to let the operator estimate the position of the section line L. Once the localized cutting line, the operator makes a visible mark M on the point of penetration at which he wishes to penetrate the cutting blade in the strip, as shown in Figure 10. As a rule the operator arranges to position the mark M closest to the edge L 2 located on the side of the sheet intended to form the heel from the rear edge PR 3 .
  • the camera 510 is then activated and the centralized control unit controls the positioning of the cutting head 51 and advance or retreat of the web so that the cutting blade 513 is positioned just to the right of the mark M.
  • the cylindrical shape is then immobilized.
  • a second alternative is to activate a device 8 for automatic detection of the front edge shown in Figures 12 and 13.
  • This device is disposed above the cylindrical shape upstream of the meeting point between the ply P and the surface of the cylindrical shape 1.
  • the device 8 is disposed at the equatorial line of the cylindrical shape on which are centered the ply and the centers PF 2 and PR 2 of the front and rear fronts.
  • the edge detection device 8 comprises a sensor responsive to the variation in height generated on the cylindrical shape 1 by the passage of said front edge PF to the right of said edge detection device 8. For this purpose, it is possible to use of a telemetric laser or a mechanical rub.
  • the cylindrical shape automatically performs an angular rotation of a predetermined angle b so as to position the front edge to the right of an imaginary line corresponding to the line of joining the front edge PF and the rear edge PR as shown in Figure 13.
  • the edge detection device 8 can generate false detections.
  • step A it is then arranged to position the cylindrical shape so that the front edge at the central portion is disposed on a predetermined sector.
  • the azimuth of this sector can usefully be part of the recipe stored in the control unit centralized.
  • Step C during which the cutting blade is penetrated into the web P can then be executed.
  • the cutting blade 513 penetrates directly into the mark M affixed by the operator and previously identified by the camera 510.
  • the cutting blade is brought to a predetermined transverse position so that the cutting blade 513 enters the sheet P at a point on the cutting line L.
  • the front edge PF and the rear edge PR can then be joined, as shown in Figure 13.
  • the cutting blade 513 and the sensor 8 are placed on the same equatorial plane .
  • step C can take place without the intervention of the operator.
  • the actual cutting operation for detaching the web P of the tape then runs automatically as follows.
  • a step D the cylindrical shape is rotated in the second circumferential direction, opposite to the first circumferential direction, by moving the cutting blade 513 between the two threads of the interlock in a first transverse direction until the cutting blade is disposed at a predetermined and non-zero distance from the first edge Li.
  • the centralized control unit stops the rotation of the cylindrical shape. This non-zero distance is of the order of 1 cm to 2 cm and prevents the cutting blade from leaving the gap in which it is maintained.
  • step E while maintaining the cutting blade 513 in the interlock, the cylindrical shape 1 is rotated in the first circumferential direction, moving the cutting blade in a second transverse direction, opposite at the first transverse direction, until the cutting blade 513 opens at the second edge L2.
  • the cutting blade 513 can be raised, and the cutting head is returned to a waiting transverse position.
  • section of the sheet is made by going from the heel PR 3 of the rear edge to the tip PRi of the rear edge. This preferred cutting direction reduces the deformation of the sheet and promote the joining of the two fronts.
  • step F the cylindrical shape is rotated in the second direction circumferential and is adhered to the rear edge PR on the cylindrical shape 1 by putting end to end the rear edge PR and the front edge PF.
  • This operation is performed by the operator who adjusts the jointing of the two fronts.
  • the reinforcing strip is progressively rewound on the winding device 7.
  • the efforts related to the detachment of the product, which are necessary to ensure the jointing of the fronts are greatly lightened by the movement of the different training mats 2 , 3 and 4 which cause the reinforcing strip P to the winding device 7 without the need to involve the operator.
  • step G using a manual tool, the operator completes the separation of the reinforcing ply from the rest of the band by cutting with a hand tool , the rubber bridge located at the first selvage Li on the few centimeters that had been left as it was after step D, and detaches the rear edge PR to complete the jointing of the rear edge PR and PF front.
  • the method according to the invention makes it possible to improve the laying accuracy of a product such as a crown reinforcing ply and to subtract the operator of the physical forces related to operations of alignment, cutting and positioning of the web, in particular when laying products for the manufacture of large-scale civil engineering tires.
  • PR Front back PRi Front edge.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Tyre Moulding (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

A method for placing a reinforcing ply (P) on a cylindrical shape (1), comprising steps during which the cylindrical shape (1) is rotated in a first circumferential direction, the ply is deposited until the front edge (PF) performs one complete turn, a penetration point is marked on the ply (P) on a cutting line (L), and a cutting blade, driven in translation along a transverse axis (ΥΥ'), is made to penetrate, between two wires, placed on the cutting line (L) at said penetration point.

Description

Procédé de pose d’une nappe de renfort sur un tambour de grande dimension  Method of laying a reinforcing ply on a large drum
[001 ] U invention concerne un procédé de réalisation d’un pneumatique comprenant une étape au cours de laquelle on dépose par enroulement une nappe de renfort sur une forme cylindrique.  [001] The invention relates to a method of producing a tire comprising a step during which is deposited by winding a reinforcing ply on a cylindrical shape.
[002] Ce procédé s’intéresse au cas des pneumatiques de grande dimension tels que les pneumatiques de génie civil, dont le diamètre au seat peut aller jusqu’à 63 pouces et dont la masse peut s’élever à plusieurs tonnes.  [002] This method is concerned with the case of large tires such as civil engineering tires, whose seat diameter can be up to 63 inches and whose mass can be several tons.
[003] La réalisation de ces pneumatiques nécessite la mise en oeuvre de composants en caoutchouc adaptés au développement de ces pneumatiques et dont la masse excède largement les capacités de manutention courantes des opérateurs en charge de ces opérations. Aussi, dans la mesure du possible, il est fait appel à des moyens aptes à soulager ces efforts de manutention.  [003] The realization of these tires requires the implementation of rubber components suitable for the development of these tires and whose mass greatly exceeds the current handling capacity of the operators in charge of these operations. Also, as far as possible, means are used to relieve these handling efforts.
[004] Le procédé selon l’invention concerne plus particulièrement la pose des nappes de renforts destinées à consolider le sommet du pneumatique. Ces nappes sont formées de tronçons de fils enrobés dans un mélange de caoutchouc, parallèles entre eux et faisant un angle donné avec la direction longitudinale de la nappe. Ces fils sont en règle générale des fils métalliques formés eux-mêmes de l’assemblage de plusieurs couches de fils enroulées sur elles-mêmes.  [004] The method according to the invention relates more particularly to the laying of reinforcing plies intended to consolidate the crown of the tire. These sheets are formed of sections of son embedded in a rubber mixture, parallel to each other and at a given angle with the longitudinal direction of the sheet. These son are generally metal son themselves formed of the assembly of several layers of son wound on themselves.
[005] Les nappes de renfort sont prélevées depuis une bande continue et sont posées sur une surface de réception telle qu’une forme sensiblement cylindrique formée de secteurs mobiles radialement ou directement sur le sommet de l’enveloppe après une étape dite de conformation au cours de laquelle on confère à l’ébauche de pneumatique sa forme torique.  The reinforcement plies are taken from a continuous strip and are placed on a receiving surface such as a substantially cylindrical shape formed of radially movable sectors or directly on the top of the envelope after a so-called conformation step during of which the tire blank is given its toric shape.
[006] On observe toutefois que, dans ces deux cas, il est très difficile de maîtriser le diamètre, et donc la circonférence de la surface de réception de la nappe de renfort. Il est donc impossible de réaliser une coupe à longueur de la nappe en amont du dispositif d’assemblage du sommet.  [006] However, it is observed that in both cases, it is very difficult to control the diameter, and therefore the circumference of the receiving surface of the reinforcing ply. It is therefore impossible to cut the length of the web upstream of the assembly device of the top.
[007] Le procédé selon l’invention, utilisant des éléments de dispositifs adaptés, a pour objet d’apporter une solution aux problèmes posés ci-dessus.  [007] The method according to the invention, using elements of adapted devices, aims to provide a solution to the problems posed above.
[008] Ce procédé prévoit de mettre en oeuvre les étapes suivantes au cours desquelles :  [008] This method provides for the following steps in which:
Etape A : on fait adhérer un front avant de la nappe de renfort sur la forme cylindrique et, en faisant tourner la forme cylindrique selon une première direction circonférentielle, on dépose la nappe sur la forme cylindrique jusqu’à ce que le front avant réalise un tour complet,  Step A: a front edge of the reinforcing ply is adhered to the cylindrical shape and, by rotating the cylindrical shape in a first circumferential direction, the ply is deposited on the cylindrical shape until the front edge makes a full turn,
Etape B : on repère sur la nappe un point de pénétration sur une ligne de coupe pour former un front arrière destiné à être mis en joint avec le front avant, Stage B: a point of penetration on a cutting line is marked on the sheet to form a trailing edge intended to be joined with the front edge,
Etape C : on fait pénétrer une lame de coupe équipant une tête de coupe pilotée en translation selon un axe transversal, entre deux fils placés sur la ligne de coupe au niveau dudit point de pénétration et définissant un entrefil,  Stage C: A cutting blade is fitted to a cutting head driven in translation along a transverse axis, between two son placed on the cutting line at said point of penetration and defining a cross-piece,
Etape D : on fait tourner la forme cylindrique selon une seconde direction circonférentielle, opposée à la première direction circonférentielle, en déplaçant la tête de coupe selon une première direction transversale jusqu’à ce que la lame de coupe soit disposée à une distance prédéterminée et non nulle d’une première lisière et, sans ressortir la lame de coupe de l’entrefil,  Step D: The cylindrical shape is rotated in a second circumferential direction, opposite the first circumferential direction, by moving the cutting head in a first transverse direction until the cutting blade is disposed at a predetermined distance and not at a predetermined distance. zero of a first selvedge and, without coming out the cutting blade of the interlock,
Etape E : on fait tourner la forme cylindrique selon la première direction circonférentielle, en déplaçant la tête de coupe selon une seconde direction transversale, opposée à la première direction transversale jusqu’à ce que la lame de coupe débouche au niveau d’une seconde lisière,  Step E: The cylindrical shape is rotated in the first circumferential direction, moving the cutting head in a second transverse direction, opposite to the first transverse direction until the cutting blade opens at a second selvedge ,
Etape F : on fait tourner la forme cylindrique selon la seconde direction circonférentielle et on fait adhérer le front arrière sur la forme cylindrique en mettant bout à bout le front arrière et le front avant,  Step F: the cylindrical shape is rotated in the second circumferential direction and the rear edge is adhered to the cylindrical shape by putting the front and the front edge end to end,
Etape G :, on détache le front arrière de la nappe au niveau de la première lisière et on achève la mise en joint du front arrière et du front avant.  Step G: detach the rear edge of the web at the first edge and complete the jointing of the trailing edge and the front edge.
[009] Il résulte de ce mode opératoire que la coupe de la nappe pour dégager le front arrière avant sa mise en joint avec le front avant se fait directement sur la forme cylindrique. L’ajustement de la longueur de la nappe, de sorte que le front avant et le front arrière puissent se joindre, résulte alors de la précision avec laquelle on détermine la position du point de pénétration.  [009] It follows from this procedure that the cutting of the web to clear the trailing edge before its joining with the front edge is directly on the cylindrical shape. The adjustment of the length of the web, so that the leading edge and the trailing edge can join, then results from the precision with which the position of the point of penetration is determined.
[0010] On observe également que la coupe à longueur de la nappe peut se faire sans qu’il soit nécessaire d’extraire la lame de coupe de l’entrefil défini par l’espace compris entre les deux fils formant les lisières du front arrière de la nappe en cours de pose et le front avant du reste de la bande continue. Cette caractéristique du procédé permet de s’affranchir du besoin de réinsérer la lame entre les deux fils et qui est difficile à réaliser à l’aide de moyens automatisés. Elle autorise également la possibilité, comme on le verra par la suite, de réaliser la plupart des opérations de coupe à l’aide de moyens motorisés pilotables par une unité de commande centralisée permettant de soulager et de réduire au juste nécessaire les interventions manuelles de l’opérateur.  It is also observed that the cutting length of the web can be done without it being necessary to extract the cutting blade of the interlocking defined by the space between the two son forming the selvedges of the rear edge of the web being laid and the front edge of the remainder of the continuous web. This feature of the method eliminates the need to reinsert the blade between the two son and is difficult to achieve using automated means. It also allows the possibility, as will be seen later, to perform most cutting operations using motorized means controllable by a centralized control unit to relieve and reduce to just the necessary manual interventions of the 'operator.
[0011 ] En particulier, ce procédé permet de réaliser des coupes le long de lisières de grande longueur pouvant atteindre jusqu’à 5m. Il permet enfin de réduire les efforts imposés à l’opérateur pour décoller la nappe et ajuster la mise en joint de la lisière avant et de la lisière arrière. In particular, this method allows cutting along long edges of up to 5m long. It finally makes it possible to reduce the forces imposed on the operator to take off the sheet and adjust the jointing of the selvedge before and the selvedge back.
[0012] Le procédé selon l'invention peut aussi comprendre isolément, ou en combinaison, l’exécution des actions suivantes :  The method according to the invention may also comprise in isolation, or in combination, the execution of the following actions:
Au cours de l’étape B, un opérateur détermine le point de pénétration et y appose une marque visible.  During step B, an operator determines the penetration point and affixes a visible mark thereon.
Au cours de l’étape C, à l’aide d’une caméra disposée sur la tête de coupe on détecte la marque disposée sur le point de pénétration, et on pilote la rotation de la forme cylindrique et le déplacement transversal de la tête de coupe pour amener ladite lame de coupe au droit dudit point de pénétration.  During step C, using a camera disposed on the cutting head, the mark placed on the point of penetration is detected, and the rotation of the cylindrical shape and the transverse displacement of the head of the cylinder are controlled. cutting to bring said cutting blade to the right of said point of penetration.
Au cours de l’étape B, on détecte le front avant à l’aide d’un dispositif de détection de front sensible à la variation de hauteur engendrée sur la forme cylindrique par le passage dudit front avant au droit dudit dispositif de détection de front, et on amène la forme cylindrique et la lame de coupe à des positions angulaires et transversales prédéterminées de sorte que, au cours de l’étape C, la lame de coupe pénètre entre deux fils au niveau du point de pénétration situé sur la ligne de coupe.  During step B, the front edge is detected by means of a front detection device sensitive to the variation of height generated on the cylindrical shape by the passage of said front edge to the right of said front detection device. , and the cylindrical shape and the cutting blade are brought to predetermined angular and transverse positions so that, in step C, the cutting blade enters between two wires at the point of penetration on the line of chopped off.
On aligne la position transversale de la lame de coupe sur la position du dispositif de détection de front.  The transverse position of the cutting blade is aligned with the position of the edge detection device.
Le dispositif de détection de front est disposé transversalement à équidistance de la première et de la seconde lisière.  The edge detection device is disposed transversely equidistant from the first and second edges.
Au cours des étapes D et E, on régule le déplacement transversal de la tête de coupe en fonction du déplacement longitudinal du tapis de pose et de l’angle formé par les fils avec la direction longitudinale.  During steps D and E, the transverse displacement of the cutting head is regulated as a function of the longitudinal displacement of the laying belt and the angle formed by the wires with the longitudinal direction.
La lame de coupe est mobile librement selon une direction transversale par rapport à la tête de coupe.  The cutting blade is freely movable in a direction transverse to the cutting head.
A l’aide d’un moyen d’évaluation de la position transversale de la lame de coupe par rapport à la tête de coupe, on ajuste le déplacement transversal de la tête de coupe de sorte que la position transversale de la lame de coupe par rapport à la tête de coupe reste dans des limites prédéterminées.  Using a means for evaluating the transverse position of the cutting blade with respect to the cutting head, the transverse displacement of the cutting head is adjusted so that the transverse position of the cutting blade by ratio to the cutting head remains within predetermined limits.
Au cours des étapes A, D, E et F, on fait circuler la nappe successivement sur un tapis de centrage puis sur un tapis de pose disposés en amont de la forme cylindrique.  During steps A, D, E and F, the web is circulated successively on a centering mat and then on a laying mat disposed upstream of the cylindrical shape.
Le tapis de centrage est mobile en rotation autour d’un axe perpendiculaire au plan du tapis de centrage sur lequel circule la nappe et, à l’aide de caméras détectant la position des lisières de la nappe, on régule la position angulaire du tapis de centrage de manière à aligner la nappe sur une position transversale prédéfinie.  The centering belt is rotatable about an axis perpendicular to the plane of the centering belt on which the lap and, using cameras detecting the position of the selvedges of the web, the angular position of the belt of the web is regulated. centering so as to align the web to a predefined transverse position.
Les fils de la nappe sont des fils métalliques, et le tapis de centrage et le tapis de pose sont munis d’un dispositif magnétique pour faire adhérer la nappe sur lesdits tapis. The threads of the tablecloth are metal threads, and the centering mat and the carpet of laying are provided with a magnetic device for adhering the sheet on said mats.
Les plans du tapis de pose et du tapis de centrage sur lesquels circule la nappe font entre eux un angle non nul.  The planes of the laying mat and the centering mat on which circulates the sheet do between them a non-zero angle.
Une force motrice fournie à la nappe par le tapis de centrage est inférieure ou égale à la moitié d’une force motrice fournie à la nappe par le tapis de pose.  A driving force supplied to the web by the centering belt is less than or equal to half of a driving force supplied to the web by the laying mat.
On ajuste la vitesse longitudinale du tapis de pose et du tapis de centrage, par rapport à la vitesse de rotation de la forme cylindrique de sorte que la tension de pose de la nappe sur la forme cylindrique est égale à une valeur prédéterminée.  The longitudinal speed of the laying belt and the centering belt is adjusted with respect to the rotation speed of the cylindrical shape so that the laying tension of the lap on the cylindrical shape is equal to a predetermined value.
A l’étape G, on détache le front arrière de la nappe à l’aide d’un outillage manuel.  In step G, the rear edge of the sheet is detached by means of manual tools.
La forme cylindrique est formée de secteurs mobiles radialement. The cylindrical shape is formed of radially movable sectors.
La forme cylindrique est le sommet d’une ébauche torique de pneumatique. The cylindrical shape is the top of a tire tire blank.
[0013] L'invention sera mieux comprise à la lecture de la description qui suit et des figures annexées, qui sont fournies à titre d'exemples et ne présentent aucun caractère limitatif, dans lesquelles : The invention will be better understood on reading the description which follows and the appended figures, which are provided by way of examples and are in no way limiting, in which:
La figure 1 représente une vue schématique en perspective d’une machine d’assemblage pour la réalisation du sommet d’un pneumatique de génie civil.  FIG. 1 represents a schematic perspective view of an assembly machine for producing the crown of a civil engineering tire.
La figure 2 représente une vue de dessus schématique d’une nappe de renfort. Figure 2 shows a schematic top view of a reinforcing ply.
La figure 3 représente une vue de dessus schématique du dispositif de centrage et de pose. Figure 3 shows a schematic top view of the centering device and laying.
Les figures 4, 5 et 6 représentent des vues de profil schématiques simplifiées du tapis de pose et du tapis de centrage au cours de la mise en oeuvre du procédé.  Figures 4, 5 and 6 show simplified schematic side views of the laying mat and the centering mat during the implementation of the method.
La figure 7 représente une vue de profil schématique du dispositif de régulation de tension.  Fig. 7 shows a schematic side view of the voltage regulating device.
La figure 8 représente une vue en perspective schématique de la tête de coupe. Figure 8 shows a schematic perspective view of the cutting head.
La figure 9 représente une vue de face schématique de la pointe de la lame de coupe. Figure 9 shows a schematic front view of the tip of the cutting blade.
La figure 10 représente une vue de face schématique de la nappe au cours de l’étape B.  Figure 10 shows a schematic front view of the web in step B.
La figure 11 représente une vue de face schématique de la nappe au cours de l’étape D ou de l’étape E.  FIG. 11 represents a schematic front view of the web during step D or step E.
Les figures 12 et 13, représentent des vues de profil schématiques du dispositif de détection de front avant. Figures 12 and 13 show schematic side views of the device front edge detection.
[0014] Dans ce qui suit on utilisera les repères dans lesquels la direction longitudinale XX’ correspond à la direction de circulation de la nappe et à la direction circonférentielle de pose. La direction YY’ correspond à la direction transversale de la nappe et à la direction axiale de la forme cylindrique. Enfin, la direction ZZ’ correspond à une direction perpendiculaire au plan de la nappe confondue lorsque la nappe est enroulée sur la forme cylindrique à la direction radiale de ladite forme cylindrique.  In what follows we will use the pins in which the longitudinal direction XX 'corresponds to the direction of flow of the web and the circumferential direction of laying. The direction YY 'corresponds to the transverse direction of the ply and to the axial direction of the cylindrical shape. Finally, the direction ZZ 'corresponds to a direction perpendicular to the plane of the merged sheet when the sheet is wound on the cylindrical shape in the radial direction of said cylindrical shape.
[0015] La machine de fabrication illustrée à la figure 1 permet de localiser les principaux organes utiles à la mise en œuvre du procédé.  The manufacturing machine illustrated in Figure 1 allows to locate the main organs used in the implementation of the method.
[0016] La forme cylindrique 1 , formée de secteurs distribués circonférentiellement et mobiles radialement, est mise en rotation autour de son axe par un moteur 10. Un codeur (non représenté) permet de connaître à tout moment la position angulaire de la forme cylindrique ainsi que la vitesse de rotation de la forme cylindrique 1 .  The cylindrical shape 1, formed of radially circumferentially circumferentially distributed sectors, is rotated about its axis by a motor 10. An encoder (not shown) allows to know at any time the angular position of the cylindrical shape and that the speed of rotation of the cylindrical form 1.
[0017] Un dérouleur motorisé 7 est disposé en amont de l’installation pour fournir à la demande la longueur de bande nécessaire pour prélever une nappe de renfort P destinée à former le sommet de l’enveloppe de pneumatique.  A motorized unwinder 7 is disposed upstream of the installation to provide on demand the tape length necessary to take a reinforcing ply P for forming the top of the tire casing.
[0018] Un premier tapis d’alimentation 4 dirige la bande vers l’aval de la machine. Ce tapis d’alimentation 4 peut être un tapis d’entrainement motorisé ou encore une table à bille autorisant un déplacement latéral de la bande. Des moyens de pré centrage mécanique, tels que des guides réglables, permettent alors de placer latéralement la bande dans un premier jeu de tolérances.  A first feed belt 4 directs the belt downstream of the machine. This feed belt 4 may be a motorized training mat or a ball table allowing lateral movement of the band. Mechanical pre-centering means, such as adjustable guides, then allow the band to be placed laterally in a first set of tolerances.
[0019] Un tapis de centrage 3 est disposé en aval du tapis d’alimentation 4, et en amont d’un tapis de pose 2. Préférentiellement, le tapis de centrage 3 et le tapis de pose 4 sont dotés d’un système magnétique, connu en soi, permettant de faire adhérer la nappe et de la maintenir en position tout au long du processus de transfert de la nappe sur les tapis 2 et 3.  A centering belt 3 is disposed downstream of the feed belt 4, and upstream of a laying belt 2. Preferably, the centering belt 3 and the laying belt 4 are provided with a magnetic system. , known per se, for adhering the web and maintain it in position throughout the process of transfer of the web on the mats 2 and 3.
[0020] Optionnellement, des bras de transferts ou des tapis magnétiques peuvent être placés entre les tapis pour assurer le passage de la pointe de la nappe d’un tapis à un autre.  Optionally, transfer arms or magnetic mats can be placed between the mats to ensure the passage of the tip of the web from one carpet to another.
[0021 ] Le dispositif de déroulage ou d’enroulage 7, le tapis d’alimentation 4, le tapis de centrage 3 et le tapis de pose 2 sont pilotés par une unité de commande centralisée qui actionne les moyens d’entrainement des tapis pour faire avancer ou reculer la nappe à une vitesse longitudinale synchronisée avec la vitesse angulaire de la forme cylindrique 1 .  The uncoiling or winding device 7, the feed belt 4, the centering belt 3 and the laying belt 2 are controlled by a centralized control unit which actuates the drive means of the mats to make advance or retreat the web at a longitudinal speed synchronized with the angular velocity of the cylindrical form 1.
[0022] Lorsque la forme cylindrique 1 est mise en rotation selon la première direction, le tapis de pose 2, le tapis de centrage 3, le tapis d’alimentation 4 et le dispositif de déroulage 7 sont actionnés selon une première direction longitudinale correspondant au déroulage et à l’alimentation d’une bande continue. Lorsque la forme cylindrique 1 est mise en rotation selon la seconde direction circonférentielle ces organes fonctionnent selon une seconde direction longitudinale de sens opposé à la première direction longitudinale et le dispositif 7 est alors configuré pour rembobiner la bande. When the cylindrical shape 1 is rotated in the first direction, the laying belt 2, the centering belt 3, the feed belt 4 and the unrolling device 7 are actuated in a first longitudinal direction corresponding to the unwinding and at feeding a continuous band. When the cylindrical shape 1 is rotated in the second circumferential direction these bodies operate in a second longitudinal direction opposite to the first longitudinal direction and the device 7 is then configured to rewind the band.
[0023] Un dispositif de coupe 5 également piloté par l’unité de commande centralisée est disposé en aval du tapis de pose 2, entre un rouleau de régulation de tension 6 et la sortie du tapis de pose. Le dispositif de coupe 5 comprend une tête de coupe 51 circulant sur un rail 50 disposé transversalement. Un réflecteur 52 est placé en arrière de la nappe.  A cutting device 5 also controlled by the centralized control unit is disposed downstream of the laying belt 2 between a voltage regulating roller 6 and the output of the laying mat. The cutting device 5 comprises a cutting head 51 running on a rail 50 arranged transversely. A reflector 52 is placed behind the web.
[0024] Le rouleau de régulation de tension 6 est disposé en aval du dispositif de coupe 5 à proximité du point de contact entre la nappe et la forme cylindrique 1 .  The voltage regulating roller 6 is disposed downstream of the cutting device 5 near the point of contact between the sheet and the cylindrical shape 1.
[0025] La figure 2 représente une nappe de renfort P, une fois détachée de la bande continue, dans laquelle on distingue une première lisière Li et une seconde lisière L2 Ces lisières latérales sont parallèles entre elles et sont distantes l’une de l’autre, dans le cas d’une nappe destinée à un pneu génie civil, d’une largeur variant de 150 millimètres à plus d’un mètre. FIG. 2 shows a reinforcing ply P, once detached from the continuous strip, in which there is a first edge Li and a second edge L 2. These lateral edges are parallel to each other and are distant from each other. other, in the case of a sheet intended for a civil engineering tire, with a width varying from 150 millimeters to more than one meter.
[0026] La nappe de renfort a une épaisseur pouvant varier de 3mm à 10mm. Les fils composant la nappe de renfort ont un diamètre allant de 1 mm à 6mm et le pas entre les fils varie, selon le type de nappe, de 2mm à 7mm.  The reinforcing ply has a thickness that can vary from 3mm to 10mm. The son making up the reinforcement ply have a diameter ranging from 1 mm to 6 mm and the pitch between the son varies, depending on the type of ply, from 2 mm to 7 mm.
[0027] Le front avant PF comprend une pointe avant PFi un talon avant PF3 et un centre avant PF2 situé sur l’intersection de la ligne équidistante des deux lisières Li et L2 avec la ligne formant le front avant. De manière analogue, le front arrière PR comprend une pointe arrière PRi , un talon arrière PR3 et un centre arrière PR2. The front edge PF comprises a front tip PFi a front heel PF 3 and a front center PF 2 located on the intersection of the equidistant line of the two edges Li and L 2 with the line forming the front edge. Similarly, the rear edge PR comprises a rear tip PRi, a rear heel PR 3 and a rear center PR 2 .
[0028] Les fils de la nappe font un angle a donné avec la direction longitudinale XX’ compris entre 0° et 60°.  The son of the ply are given an angle with the longitudinal direction XX 'between 0 ° and 60 °.
[0029] Les valeurs de largeur et d’angle indiquées ci-dessus conduisent à l’obtention d’un front de nappe dont la longueur varie de 300 mm à plus de 5m.  The width and angle values indicated above lead to obtaining a sheet front whose length varies from 300 mm to more than 5m.
[0030] Ces données chiffrées permettent aussi de mieux évaluer les longueurs et les masses mises en jeu, ainsi que l’intérêt de faciliter la réalisation de la coupe et de la pose de la nappe.  These figures also make it possible to better evaluate the lengths and the masses involved, as well as the interest of facilitating the realization of the cutting and the laying of the sheet.
[0031 ] La figure 3 illustre le fonctionnement du dispositif de centrage dynamique. Le tapis de centrage 3 représenté à la figure 3 est monté en rotation autour d’un axe 30 perpendiculaire au plan du tapis de centrage 3. Un vérin d’actionnement 32 permet de piloter la position angulaire du tapis de centrage par rapport à la direction longitudinale XX’. Des caméras 31 disposées de part et d’autre de la nappe entre le tapis de centrage 3 et le tapis de pose 2, détectent la position des lisières Li et L2 par rapport à un axe de centrage. Cet axe de centrage peut être aligné sur une ligne équatoriale de la forme cylindrique ou décalé latéralement selon le type de nappe à poser. [0031] Figure 3 illustrates the operation of the dynamic centering device. The centering belt 3 shown in FIG. 3 is rotatably mounted about an axis 30 perpendicular to the plane of the centering belt 3. An actuating cylinder 32 makes it possible to control the angular position of the centering belt with respect to the direction longitudinal XX '. Cameras 31 disposed on either side of the web between the centering belt 3 and the laying belt 2, detect the position of the edges Li and L 2 with respect to a centering axis. This centering axis may be aligned on an equatorial line of the cylindrical shape or shifted laterally depending on the type of sheet to be laid.
[0032] L’information concernant le positionnement des lisières obtenue par les caméras 31 est transmise à l’unité de commande centralisée qui commande la position du vérin 32 pour modifier la position latérale de la nappe de sorte que la nappe pénètre sur le tapis de pose 2 en étant parfaitement alignée sur l’axe de centrage.  The information concerning the positioning of the selvedges obtained by the cameras 31 is transmitted to the centralized control unit which controls the position of the jack 32 to modify the lateral position of the sheet so that the sheet penetrates the mat of poses 2 being perfectly aligned with the centering axis.
[0033] Lorsque seul le front avant ou le front arrière de la nappe reposent sur le tapis de centrage on choisira d’aligner la nappe par rapport à la seule position de la lisière formant la partie latérale dudit front.  When only the front edge or the rear edge of the ply rest on the centering mat will be chosen to align the ply with respect to the single position of the edge forming the side portion of said front.
[0034] Les figures 4, 5 et 6 illustrent une particularité de mise en oeuvre du procédé de déroulage liée à la forte épaisseur de la nappe.  Figures 4, 5 and 6 illustrate a particular implementation of the peeling process related to the thick layer of the web.
[0035] Lorsque le tapis de centrage 3 et le tapis de pose 2 sont disposés sur un même plan la fibre neutre de la nappe circule à la même vitesse que la face de la nappe P en contact avec la surface des tapis, comme cela est illustré à la figure 4.  When the centering belt 3 and the laying belt 2 are arranged on the same plane the neutral fiber of the web travels at the same speed as the face of the web P in contact with the surface of the carpet, as is illustrated in Figure 4.
[0036] Lorsque, au moment de la pose de la nappe, on abaisse le tapis de pose 2 en direction de la forme cylindrique 1 , le plan du tapis de pose 2 fait un angle a non nul avec le plan du tapis de centrage 3. La nappe circule alors sur la partie cylindrique du rouleau d’entrainement 21 disposée du côté amont du tapis de pose.  When, at the time of laying the sheet, the laying mat 2 is lowered in the direction of the cylindrical shape 1, the plane of the laying mat 2 makes a non-zero angle α with the plane of the centering mat 3 The web then travels on the cylindrical portion of the drive roller 21 disposed on the upstream side of the laying mat.
[0037] Il résulte de ces positionnements respectifs qu’au niveau de ladite partie cylindrique, la vitesse circonférentielle de la nappe dépend de la distance au centre de rotation du rouleau 21 . La partie de la nappe en contact avec la partie cylindrique aura une vitesse de déplacement circonférentielle égale au produit de la vitesse angulaire du rouleau 21 par le rayon r. En revanche la vitesse circonférentielle de la fibre neutre de la nappe sera égale au produit de la vitesse angulaire du rouleau 21 par le rayon r augmenté de la demi épaisseur de la nappe P. Lorsque la nappe a une forte épaisseur, on observe la formation d’un décollement de la nappe à l’entrée du tapis de pose comme cela est illustré à la figure 6.  It follows from these respective positions that at said cylindrical portion, the circumferential speed of the web depends on the distance to the center of rotation of the roller 21. The portion of the web in contact with the cylindrical portion will have a circumferential movement speed equal to the product of the angular velocity of the roller 21 by the radius r. On the other hand, the circumferential speed of the neutral fiber of the ply will be equal to the product of the angular velocity of the roller 21 by the radius r increased by the half thickness of the ply P. When the ply has a large thickness, the formation of the ply is observed. detachment of the sheet at the entrance of the laying mat as illustrated in FIG. 6.
[0038] Pour réduire ce phénomène gênant, il est proposé de créer un léger glissement entre les deux tapis, en augmentant la force motrice du tapis de pose 2 par rapport à la force motrice du tapis de centrage 3. En pratique, on ajuste la force motrice fournie par le tapis de centrage 3 pour faire avancer la nappe de sorte qu’elle soit inférieure ou égale à la moitié de la force motrice pour faire avancer la nappe fournie par le tapis de pose 2.  To reduce this annoying phenomenon, it is proposed to create a slight sliding between the two mats, increasing the driving force of the laying belt 2 relative to the driving force of the centering belt 3. In practice, it adjusts the driving force provided by the centering belt 3 to advance the web so that it is less than or equal to half of the driving force to advance the web provided by the conveyor belt 2.
[0039] La figure 7 illustre le fonctionnement du dispositif de régulation de tension comprenant un rouleau dynamométrique 6 autour duquel la nappe de renfort circule lorsque le tapis de pose 2 est en position basse. Après étalonnage, la force radiale exercée par la nappe sur le rouleau 6 permet d’estimer la tension de pose. FIG. 7 illustrates the operation of the voltage regulation device comprising a dynamometric roller 6 around which the reinforcing ply flows when the laying mat 2 is in the low position. After calibration, the radial force exerted by the ply on the roller 6 allows to estimate the laying tension.
[0040] Un dispositif de régulation, relié à l’unité de commande centralisée, agit alors sur la vitesse des tapis 2, 3 et 4 pour maintenir la tension de pose à une valeur prédéterminée.  A regulating device, connected to the centralized control unit, then acts on the speed of the belts 2, 3 and 4 to maintain the laying tension to a predetermined value.
[0041 ] Une première boucle de régulation « en aveugle » permet de synchroniser la vitesse des tapis sur la vitesse angulaire de la forme cylindrique. Toutefois, comme cela a été évoqué ci-dessus la vitesse tangentielle au niveau du point de contact entre la nappe et la surface de la forme cylindrique peut connaître des variations sensibles liées à la non maîtrise du diamètre de la forme cylindrique, et à la présence des profilés posés précédemment.  A first control loop "blind" synchronizes the speed of the carpet on the angular velocity of the cylindrical shape. However, as mentioned above, the tangential velocity at the point of contact between the ply and the surface of the cylindrical shape can experience significant variations related to the non-control of the diameter of the cylindrical shape, and to the presence profiles previously laid.
[0042] La régulation de la tension autour d’une valeur de consigne pouvant varier entre 100N et 300N se superpose à la première boucle de régulation et permet de s’affranchir de ces incertitudes. Le dispositif de régulation de tension peut être activé quelle que soit la direction circonférentielle imposée à la forme cylindrique 1 .  The regulation of the voltage around a setpoint which can vary between 100N and 300N is superimposed on the first control loop and makes it possible to overcome these uncertainties. The voltage regulation device can be activated regardless of the circumferential direction imposed on the cylindrical shape 1.
[0043] Les figures 8 et 9 permettent de visualiser plus en détail la tête de coupe 51 montée par l’intermédiaire d’un bras de support 515 sur un chariot (non visible) coulissant sur le rail transversal 50. La coupe de la nappe s’effectue en déplaçant la nappe selon la direction longitudinale XX’ et en déplaçant le chariot supportant la tête de coupe 51 selon la direction transversale YY’. Le rapport du déplacement transversal de la tête de coupe 51 et du déplacement longitudinal de la nappe P est égal à la tangente de l’angle formé par les fils de la nappe avec la direction longitudinale.  Figures 8 and 9 show a more detailed view of the cutting head 51 mounted by means of a support arm 515 on a carriage (not visible) sliding on the transverse rail 50. The cut of the tablecloth is performed by moving the web in the longitudinal direction XX 'and moving the carriage supporting the cutting head 51 in the transverse direction YY'. The ratio of the transverse displacement of the cutting head 51 and the longitudinal displacement of the ply P is equal to the tangent of the angle formed by the threads of the ply with the longitudinal direction.
[0044] La tête de coupe 51 comprend un corps 512 supportant une lame de coupe 513. Un dispositif motorisé (non visible) permet d’actionner la lame de coupe selon la direction ZZ’ pour faire pénétrer la lame dans l’entrefil formé par la ligne de coupe L.  The cutting head 51 comprises a body 512 supporting a cutting blade 513. A motorized device (not visible) allows to actuate the cutting blade in the direction ZZ 'to penetrate the blade in the interstice formed by the section line L.
[0045] Pour faciliter l’introduction de la lame de coupe 513 et éviter la détérioration des fils de renfort W lors de la pénétration selon l’axe ZZ’ de la lame dans la nappe, la pointe de la lame 513 est munie d’un élément sphérique 514 permettant de guider la lame entre deux fils de renfort W, comme cela est illustré à la figure 9. Le diamètre de l’élément sphérique est utilement de l’ordre de 4mm. Un dispositif de chauffage permet de maintenir la lame de coupe 513 à une température régulée de l’ordre de 60°C.  To facilitate the introduction of the cutting blade 513 and prevent the deterioration of the reinforcing son W during the penetration along the axis ZZ 'of the blade in the sheet, the tip of the blade 513 is provided with a spherical element 514 for guiding the blade between two reinforcing son W, as shown in Figure 9. The diameter of the spherical element is usefully of the order of 4mm. A heater keeps the cutting blade 513 at a controlled temperature of the order of 60 ° C.
[0046] Une enclume (non représentée) peut être approchée du dos de la nappe au droit du point de pénétration de la lame de coupe, pour faciliter la pénétration de la lame dans la nappe.  An anvil (not shown) can be approached from the back of the web to the right of the point of penetration of the cutting blade, to facilitate the penetration of the blade into the web.
[0047] La position angulaire de la lame de coupe 513 autour de l’axe ZZ’ peut également être ajustée pour correspondre sensiblement à l’angle formé par les fils de la nappe P avec la direction longitudinale.  The angular position of the cutting blade 513 about the axis ZZ 'can also be adjusted to correspond substantially to the angle formed by the son of the web P with the longitudinal direction.
[0048] La lame de coupe 514 comporte deux fils de coupe tranchants opposés l’un à l’autre de manière à autoriser la découpe de la nappe quel que soit le sens de circulation de la lame de coupe dans l’entrefil. The cutting blade 514 has two sharp cutting son opposed to each other so as to allow cutting of the web regardless of the direction of flow of the cutting blade in the interlacing.
[0049] Enfin, la lame de coupe 513 est libre de se déplacer dans la direction transversale YY’ par rapport au corps 512. Ce déplacement s’effectue entre deux limites distantes d’une valeur d. Un capteur 516 tel qu’un laser permet d’évaluer la position latérale de la lame à l’intérieur de ce débattement dont la valeur est de l’ordre du centimètre. On observe en effet que l’angle formé par les fils le long de la ligne de coupe n’est pas rigoureusement constant et que la lame peut être déportée latéralement dans un sens ou dans un autre. Un ressort de rappel (non visible), faiblement taré, permet de ramener la lame au point zéro lorsque la lame est sortie de l’entrefil.  Finally, the cutting blade 513 is free to move in the transverse direction YY 'relative to the body 512. This movement is between two limits distant from a value d. A sensor 516 such as a laser makes it possible to evaluate the lateral position of the blade within this clearance, the value of which is of the order of one centimeter. It is observed in fact that the angle formed by the son along the section line is not strictly constant and the blade can be offset laterally in one direction or another. A return spring (not visible), low taring, allows to bring the blade back to the zero point when the blade is out of the interlock.
[0050] Lorsque l’écart transversal imposé par les fils dépasse la valeur du débattement libre, le capteur 516 envoie un signal à l’unité de commande centralisée qui pilote le déplacement du chariot circulant sur le rail 50 et supportant la tête de coupe pour replacer la lame à l’intérieur des limites dans lesquelles le débattement reste libre.  When the transverse deviation imposed by the son exceeds the value of the free travel, the sensor 516 sends a signal to the centralized control unit which controls the movement of the carriage running on the rail 50 and supporting the cutting head for replace the blade within the limits in which the deflection remains free.
[0051 ] Des cellules 511 placées des deux côtés du corps 512 de la tête de coupe permettent d’évaluer la position de la lame par rapport à la première lisière Li ou à la deuxième lisière L2. La lumière réfléchie par le réflecteur 52 est détecté par les cellules 511 , et un signal est envoyé à l’unité de commande centralisée. Cells 511 placed on both sides of the body 512 of the cutting head to evaluate the position of the blade relative to the first edge Li or the second edge L 2 . The light reflected by the reflector 52 is detected by the cells 511, and a signal is sent to the centralized control unit.
[0052] Une caméra 510 placée sur le corps 512, également reliée à l’unité de commande centralisée, permet de détecter, comme on le verra par la suite, la position d’une marque particulière M réalisée sur la surface de la nappe.  A camera 510 placed on the body 512, also connected to the centralized control unit, to detect, as will be seen later, the position of a particular mark M made on the surface of the web.
[0053] Après avoir décrit les éléments de dispositif nécessaires à la mise en oeuvre de l’invention on s’attachera dans ce qui suit à décrire les principales étapes du procédé formant l’objet proprement dit de l’invention. After describing the device elements necessary for the implementation of the invention will be given in what follows to describe the main steps of the process forming the actual object of the invention.
[0054] Au cours d’une première étape A, on déroule la bande pour présenter le front avant sur la forme cylindrique 1 . L’opérateur fait adhérer la pointe du front avant PF sur la forme cylindrique 1 et lance la mise en rotation de la forme cylindrique selon une première direction circonférentielle, pour déposer la nappe sur la forme cylindrique jusqu’à ce que le front avant PF réalise sensiblement un tour complet.  During a first step A, the strip is unfolded to present the front edge on the cylindrical shape 1. The operator adheres the tip of the front edge PF to the cylindrical shape 1 and initiates the rotation of the cylindrical shape in a first circumferential direction, to deposit the sheet on the cylindrical shape until the front edge PF realizes substantially a complete turn.
[0055] Au cours de cette étape, comme on l’a vu ci-dessus, les moyens de guidage et de centrage permettent de positionner la nappe de manière précise tout en assurant une tension de pose régulière. [0056] L’étape B suivante commence lorsque le front avant PF se présente à nouveau devant l’opérateur. Au cours de cette étape B on repère sur la nappe un point de pénétration sur une ligne de coupe L pour former un front arrière PR destiné à être mis en joint avec le front avant PF. During this step, as seen above, the guiding and centering means allow to position the sheet accurately while ensuring a regular laying tension. The next step B begins when the front edge PF is again in front of the operator. During this step B is marked on the web a penetration point on a section line L to form a rear edge PR to be joined with the front edge PF.
[0057] Une première alternative consiste à laisser l’opérateur estimer la position de la ligne de coupe L. Une fois la ligne de coupe localisée, l’opérateur réalise une marque visible M sur le point de pénétration au niveau duquel il souhaite faire pénétrer la lame de coupe dans la bande, comme cela est illustré à la figure 10. En règle générale l’opérateur s’arrange pour positionner la marque M au plus proche de la lisière L2 située du côté de la nappe destinée à former le talon du front arrière PR3. A first alternative is to let the operator estimate the position of the section line L. Once the localized cutting line, the operator makes a visible mark M on the point of penetration at which he wishes to penetrate the cutting blade in the strip, as shown in Figure 10. As a rule the operator arranges to position the mark M closest to the edge L 2 located on the side of the sheet intended to form the heel from the rear edge PR 3 .
[0058] La caméra 510 est alors activée et l’unité de commande centralisée pilote le positionnement de la tête de coupe 51 et l’avance ou le recul de la nappe pour que la lame de coupe 513 se positionne juste au droit de la marque M. La forme cylindrique est alors immobilisée.  The camera 510 is then activated and the centralized control unit controls the positioning of the cutting head 51 and advance or retreat of the web so that the cutting blade 513 is positioned just to the right of the mark M. The cylindrical shape is then immobilized.
[0059] Une seconde alternative consiste à activer un dispositif 8 de détection automatique du front avant illustré aux figures 12 et 13.  A second alternative is to activate a device 8 for automatic detection of the front edge shown in Figures 12 and 13.
[0060] Ce dispositif est disposé au-dessus de la forme cylindrique en amont du point de rencontre entre la nappe P et la surface de la forme cylindrique 1 . Pour plus de précision, le dispositif 8 est disposé au niveau de la ligne équatoriale de la forme cylindrique sur laquelle sont centrés la nappe et les centres PF2 et PR2 des fronts avant et arrière. This device is disposed above the cylindrical shape upstream of the meeting point between the ply P and the surface of the cylindrical shape 1. For greater precision, the device 8 is disposed at the equatorial line of the cylindrical shape on which are centered the ply and the centers PF 2 and PR 2 of the front and rear fronts.
[0061 ] Le dispositif de détection de front 8 comprend un capteur sensible à la variation de hauteur engendrée sur la forme cylindrique 1 par le passage dudit front avant PF au droit dudit dispositif de détection de front 8. A cet effet, on peut faire l’usage d’un laser télémétrique ou encore d’un frotteur mécanique. Une fois le passage du front détecté, comme cela est illustré à la figure 12, la forme cylindrique effectue automatiquement une rotation angulaire d’un angle b prédéterminé de manière à positionner le front avant au droit d’une ligne imaginaire correspondant à la ligne de mise en joint du front avant PF et du front arrière PR comme cela est illustré à la figure 13.  The edge detection device 8 comprises a sensor responsive to the variation in height generated on the cylindrical shape 1 by the passage of said front edge PF to the right of said edge detection device 8. For this purpose, it is possible to use of a telemetric laser or a mechanical rub. Once the passage of the detected front, as illustrated in FIG. 12, the cylindrical shape automatically performs an angular rotation of a predetermined angle b so as to position the front edge to the right of an imaginary line corresponding to the line of joining the front edge PF and the rear edge PR as shown in Figure 13.
[0062] La rotation de la forme cylindrique 1 est alors interrompue.  The rotation of the cylindrical shape 1 is then interrupted.
[0063] Lorsque la forme cylindrique 1 est formée par l’assemblage de secteurs séparées par des espaces vides, le dispositif de détection 8 de front peut générer des détections à tort. On s’arrange alors, au cours de l’étape A, pour positionner la forme cylindrique de sorte que le front avant au niveau de la partie centrale soit disposé sur un secteur prédéterminé. L’azimut de ce secteur peut utilement faire partie de la recette enregistrée dans l’unité de commande centralisée. When the cylindrical shape 1 is formed by the assembly of sectors separated by empty spaces, the edge detection device 8 can generate false detections. In step A, it is then arranged to position the cylindrical shape so that the front edge at the central portion is disposed on a predetermined sector. The azimuth of this sector can usefully be part of the recipe stored in the control unit centralized.
[0064] L’étape C au cours de laquelle on fait pénétrer la lame de coupe dans la nappe P peut alors s’exécuter.  Step C during which the cutting blade is penetrated into the web P can then be executed.
[0065] Selon la première alternative, la lame de coupe 513, pénètre directement dans la marque M apposée par l’opérateur et préalablement repérée par la caméra 510.  According to the first alternative, the cutting blade 513, penetrates directly into the mark M affixed by the operator and previously identified by the camera 510.
[0066] Selon la seconde alternative, on amène la lame de coupe à une position transversale prédéterminée de sorte que la lame de coupe 513 pénètre dans la nappe P en un point situé sur la ligne de coupe L. En rabattant la partie arrière de la nappe sur la forme cylindrique 1 , le front avant PF et le front arrière PR peuvent alors être mis en joint, comme cela est illustré à la figure 13. Préférentiellement, la lame de coupe 513 et le capteur 8 sont placés sur le même plan équatorial.  According to the second alternative, the cutting blade is brought to a predetermined transverse position so that the cutting blade 513 enters the sheet P at a point on the cutting line L. By folding the rear part of the ply on the cylindrical shape 1, the front edge PF and the rear edge PR can then be joined, as shown in Figure 13. Preferably, the cutting blade 513 and the sensor 8 are placed on the same equatorial plane .
[0067] On observera ici que l’étape C peut se dérouler sans l’intervention de l’opérateur.  It will be observed here that step C can take place without the intervention of the operator.
[0068] L’opération de coupe proprement dite permettant de détacher la nappe P de la bande s’exécute alors de manière automatique de la façon suivante.  The actual cutting operation for detaching the web P of the tape then runs automatically as follows.
[0069] Au cours d’une étape D, on fait tourner la forme cylindrique selon la seconde direction circonférentielle, opposée à la première direction circonférentielle, en déplaçant la lame de coupe 513 entre les deux fils de l’entrefil selon une première direction transversale jusqu’à ce que la lame de coupe soit disposée à une distance prédéterminée et non nulle de la première lisière Li . Dès qu’une cellule 511 détecte la présence de la lisière, l’unité de commande centralisée arrête la rotation de la forme cylindrique. Cette distance non nulle est de l’ordre de 1 cm à 2 cm et permet d’éviter que la lame de coupe ne sorte de l’entrefil dans laquelle elle est maintenue.  During a step D, the cylindrical shape is rotated in the second circumferential direction, opposite to the first circumferential direction, by moving the cutting blade 513 between the two threads of the interlock in a first transverse direction until the cutting blade is disposed at a predetermined and non-zero distance from the first edge Li. As soon as a cell 511 detects the presence of the selvedge, the centralized control unit stops the rotation of the cylindrical shape. This non-zero distance is of the order of 1 cm to 2 cm and prevents the cutting blade from leaving the gap in which it is maintained.
[0070] Au cours de l’étape E, tout en maintenant la lame de coupe 513 dans l’entrefil, on fait tourner la forme cylindrique 1 selon la première direction circonférentielle, en déplaçant la lame de coupe selon une seconde direction transversale, opposée à la première direction transversale, jusqu’à ce que la lame de coupe 513 débouche au niveau de la seconde lisière L2. La lame de coupe 513 peut être relevée, et la tête de coupe est ramenée à une position transversale d’attente.  During step E, while maintaining the cutting blade 513 in the interlock, the cylindrical shape 1 is rotated in the first circumferential direction, moving the cutting blade in a second transverse direction, opposite at the first transverse direction, until the cutting blade 513 opens at the second edge L2. The cutting blade 513 can be raised, and the cutting head is returned to a waiting transverse position.
[0071 ] On observera que la coupe de la nappe se fait en allant du talon PR3 du front arrière vers la pointe PRi du front arrière. Ce sens de coupe préféré permet de réduire la déformation de la nappe et de favoriser la mise en joint des deux fronts. It will be observed that the section of the sheet is made by going from the heel PR 3 of the rear edge to the tip PRi of the rear edge. This preferred cutting direction reduces the deformation of the sheet and promote the joining of the two fronts.
[0072] Pendant cette étape E, l’intervention de l’opérateur n’est pas nécessaire.  During this step E, the intervention of the operator is not necessary.
[0073] A l’étape F, on fait tourner la forme cylindrique selon la seconde direction circonférentielle et on fait adhérer le front arrière PR sur la forme cylindrique 1 en mettant bout à bout le front arrière PR et le front avant PF. Cette opération est réalisée par l’opérateur qui ajuste la mise en joint des deux fronts. La bande de renfort est progressivement rembobinée sur le dispositif d’enroulage 7. Toutefois, les efforts liés au décollement du produit, qui sont nécessaires pour assurer la mise en joint des fronts, sont grandement allégés par le mouvement des différents tapis d’entrainement 2, 3 et 4 qui entraînent la bande de renfort P vers le dispositif d’enroulage 7 sans qu’il soit nécessaire de faire intervenir l’opérateur. In step F, the cylindrical shape is rotated in the second direction circumferential and is adhered to the rear edge PR on the cylindrical shape 1 by putting end to end the rear edge PR and the front edge PF. This operation is performed by the operator who adjusts the jointing of the two fronts. The reinforcing strip is progressively rewound on the winding device 7. However, the efforts related to the detachment of the product, which are necessary to ensure the jointing of the fronts, are greatly lightened by the movement of the different training mats 2 , 3 and 4 which cause the reinforcing strip P to the winding device 7 without the need to involve the operator.
[0074] Enfin, à l’étape G, à l’aide d’un outillage manuel, l’opérateur, achève la séparation de la nappe de renfort du reste de la bande en coupant, à l’aide d’un outil manuel, le pont de gomme situé au niveau de la première lisière Li sur les quelques centimètres qui avait été laissés en l’état à l’issue de l’étape D, et détache le front arrière PR pour achever la mise en joint du front arrière PR et du front avant PF.  Finally, in step G, using a manual tool, the operator completes the separation of the reinforcing ply from the rest of the band by cutting with a hand tool , the rubber bridge located at the first selvage Li on the few centimeters that had been left as it was after step D, and detaches the rear edge PR to complete the jointing of the rear edge PR and PF front.
[0075] Pour parfaire la pose de la nappe, il est alors possible, lorsque cela est nécessaire, d’activer des moyens de rouletage permettant de favoriser l’adhésion de la nappe sur la nappe posée précédemment.  To complete the laying of the web, it is then possible, when necessary, to activate rolling means for promoting the adhesion of the web on the previously laid web.
[0076] Ainsi, tout en mettant en œuvre des dispositifs pour la plupart connus en soi, le procédé selon l’invention permet d’améliorer la précision de pose d’un produit tel qu’une nappe de renfort sommet et de soustraire l’opérateur des efforts physiques liés aux opérations d’alignement, de coupe et de positionnement de la nappe, en particulier lors de la pose de produits destinés à la fabrication de pneumatique génie civil de grande dimension. Thus, while using devices which are for the most part known per se, the method according to the invention makes it possible to improve the laying accuracy of a product such as a crown reinforcing ply and to subtract the operator of the physical forces related to operations of alignment, cutting and positioning of the web, in particular when laying products for the manufacture of large-scale civil engineering tires.
NOMENCLATURE NOMENCLATURE
1 Forme cylindrique. 1 Cylindrical shape.
10 Moteur.  10 Engine.
2 Tapis de pose.  2 Carpet of pose.
21 Rouleau d’entrainement amont du tapis de pose.  21 Roll upstream of the laying mat.
3 Tapis de centrage.  3 Centering mat.
30 Axe de rotation du tapis d’alignement.  Axis of rotation of the alignment mat.
31 Caméras de visualisation des lisières disposées entre le tapis de centrage et le tapis de pose.  31 Edge viewing cameras arranged between the centering mat and the laying mat.
32 Vérin d’actionnement du tapis de centrage.  32 Actuating cylinder for the centering belt.
4 Tapis d’alimentation.  4 Feeding mat.
5 Dispositif de coupe.  5 Cutting device.
50 Rail transversal de circulation de la tête de coupe.  50 Transverse rail for circulation of the cutting head.
51 Tête de coupe.  51 Cutting head.
510 Caméra de repérage de la marque disposée sur le corps de la tête de coupe.  510 Marker tracking camera located on the body of the cutting head.
511 Cellules de repérage des lisières disposées sur le corps de la tête de coupe.  511 Seam locating cells disposed on the body of the cutting head.
512 Corps du dispositif de coupe.  512 Body of the cutting device.
513 Lame de coupe.  513 Cutting blade.
514 Pointe sphérique.  514 Spherical tip.
515 Bras support.  515 Support arm.
516 Capteur laser/Moyen d’évaluation de la position transversale de la lame de coupe par rapport au dispositif de coupe.  516 Laser sensor / means for evaluating the transverse position of the cutting blade with respect to the cutting device.
52 Réflecteur.  52 Reflector.
6 Rouleau dynamométrique de régulation de tension de pose.  6 Dynamometric roll of regulation of tension of pose.
7 Dispositif d’enroulage et de déroulage motorisé.  7 Motorized winding and unwinding device.
8 Dispositif de détection du front avant.  8 Front edge detection device.
a Angle des fils avec la direction longitudinale. a Angle of the wires with the longitudinal direction.
P Nappe de fils.  P Thread tablecloth.
PF Front avant.  PF Front Front.
PFi Pointe front avant.  PFi Forehead tip.
PF2 Centre front avant. PF 2 Front center front.
PF3 Talon front avant. PF 3 Heel forehead.
PR Front arrière. PRi Pointe front arrière. PR Front back. PRi Front edge.
PR2 Centre front arrière.  PR2 Center front back.
PR3 Talon front arrière. PR 3 Talon front heel.
W Fils de renfort.  W Reinforcement threads.
L1 Première lisière. L1 First edge.
I_2 Deuxième lisière.  I_2 Second edge.
L Ligne de coupe.  L Cut line.
M Marque/point de pénétration.  M Brand / point of penetration.
XX’ Axe longitudinal/direction circonférentielle.  XX 'Longitudinal axis / circumferential direction.
YY’ Axe transversal. YY 'Transverse axis.
ZZ’ Axe perpendiculaire au plan de la nappe/axe radial.  ZZ 'Axis perpendicular to the plane of the lap / radial axis.
d Débattement libre dans des limites prédéterminées de la lame de coupe dans la direction transversale. d Free travel within predetermined limits of the cutting blade in the transverse direction.
r Rayon du rouleau d’entrainement amont du tapis de pose. r Radius of the drive roller upstream of the conveyor belt.

Claims

REVENDICATIONS
1 . Procédé de pose sur une forme cylindrique (1 ) animée en rotation d’une nappe de renfort (P) composée de fils (W) enrobés dans un mélange de caoutchouc, parallèles entre eux et faisant un angle donné (a) avec la direction longitudinale (XX’) de la nappe, comprenant les étapes au cours desquelles : 1. Method for laying on a cylindrical shape (1) rotated by a reinforcing ply (P) composed of threads (W) embedded in a rubber mixture, parallel to one another and forming a given angle (a) with the longitudinal direction (XX ') of the web, comprising the steps in which:
Etape A : on fait adhérer un front avant (PF) de la nappe de renfort (P) sur la forme cylindrique (1 ) et, en faisant tourner la forme cylindrique (1 ) selon une première direction circonférentielle, on dépose la nappe de renfort (P) sur la forme cylindrique (1 ) jusqu’à ce que le front avant (PF) réalise un tour complet,  Step A: a front edge (PF) of the reinforcing ply (P) is adhered to the cylindrical shape (1) and, by rotating the cylindrical shape (1) in a first circumferential direction, the reinforcing ply is deposited. (P) on the cylindrical shape (1) until the front edge (PF) performs a complete revolution,
Etape B : on repère sur la nappe (P) un point de pénétration sur une ligne de coupe (L) pour former un front arrière (PR) destiné à être mis en joint avec le front avant (PF),  Step B: marking on the web (P) a point of penetration on a cutting line (L) to form a rear edge (PR) intended to be joined with the front edge (PF),
Etape C : on fait pénétrer une lame de coupe (513) équipant une tête de coupe (51 ) pilotée en translation selon un axe transversal (YY’), entre deux fils, placés sur la ligne de coupe (L) au niveau dudit point de pénétration et définissant un entrefil, Stage C: a cutting blade (513) fitted to a cutting head (51) driven in translation along a transverse axis (YY '), between two wires, placed on the cutting line (L) at said point, is penetrated penetration and defining a snake,
Etape D : on fait tourner la forme cylindrique (1 ) selon une seconde direction circonférentielle, opposée à la première direction circonférentielle, en déplaçant la tête de coupe (51 ) selon une première direction transversale jusqu’à ce que la lame de coupe (513) soit disposée à une distance prédéterminée et non nulle d’une première lisière (U) et, sans ressortir la lame de coupe (513) de l’entrefil, Step D: The cylindrical shape (1) is rotated in a second circumferential direction, opposite to the first circumferential direction, by moving the cutting head (51) in a first transverse direction until the cutting blade (513 ) is disposed at a predetermined distance and not zero of a first edge (U) and, without leaving the cutting blade (513) of the interleaved,
Etape E : on fait tourner la forme cylindrique (1 ) selon la première direction circonférentielle, en déplaçant la tête de coupe (51 ) selon une seconde direction transversale, opposée à la première direction transversale jusqu’à ce que la lame de coupe (513) débouche au niveau d’une seconde lisière (L2), Step E: The cylindrical shape (1) is rotated in the first circumferential direction, moving the cutting head (51) in a second transverse direction opposite to the first transverse direction until the cutting blade (513 ) opens at a second edge (L 2 ),
Etape F : on fait tourner la forme cylindrique (1 ) selon la seconde direction circonférentielle et on fait adhérer le front arrière (PR) sur la forme cylindrique (1 ) en mettant bout à bout le front arrière (PR) et le front avant (PF),  Step F: the cylindrical shape (1) is rotated in the second circumferential direction and the rear edge (PR) is adhered to the cylindrical shape (1) by putting the rear edge (PR) and the front edge ( FP)
Etape G : on détache le front arrière (PR) de la nappe au niveau de la première lisière (U) et on achève la mise en joint du front arrière (PR) et du front avant (PF). Step G: the rear edge (PR) is detached from the web at the first edge (U) and the rear edge (PR) and the front edge (PF) are joined.
2. Procédé selon la revendication 1 dans lequel, au cours de l’étape B, un opérateur détermine le point de pénétration et y appose une marque visible (M). 2. The method of claim 1 wherein, during step B, an operator determines the point of penetration and affixes a visible mark (M).
3. Procédé selon la revendication 2 dans lequel, au cours de l’étape C, à l’aide d’une caméra (510) disposée sur la tête de coupe (51 ) on détecte la marque (M) disposée sur le point de pénétration, et on pilote la rotation de la forme cylindrique (1 ) et le déplacement transversal de la tête de coupe (51 ) pour amener ladite lame de coupe (513) au droit dudit point de pénétration (M). 3. The method of claim 2 wherein, during step C, using a camera (510) disposed on the cutting head (51) is detected mark (M) disposed on the point of penetration, and one drives the rotation of the cylindrical shape (1) and the displacement transversely of the cutting head (51) for bringing said cutting blade (513) to the right of said point of penetration (M).
4. Procédé selon la revendication 1 , dans lequel, au cours de l’étape B, on détecte le front avant (PF) à l’aide d’un dispositif de détection de front (8) sensible à la variation de hauteur engendrée sur la forme cylindrique (1 ) par le passage dudit front avant (PF) au droit dudit dispositif de détection de front (8), et on amène la forme cylindrique (1 ) et la lame de coupe (513) à des positions angulaires et transversales prédéterminées de sorte que, au cours de l’étape C, la lame de coupe pénètre entre deux fils (W) au niveau du point de pénétration situé sur la ligne de coupe (L).  4. Method according to claim 1, wherein, during step B, the front edge (PF) is detected by means of an edge detection device (8) sensitive to the variation of height generated on the cylindrical shape (1) through the passage of said front edge (PF) to the right of said edge detection device (8), and the cylindrical shape (1) and the cutting blade (513) are brought to angular and transverse positions predetermined, so that in step C the cutting blade enters between two wires (W) at the point of penetration on the cutting line (L).
5. Procédé selon la revendication 4 dans lequel on aligne la position transversale de la lame de coupe (513) sur la position du dispositif de détection de front (8).  5. Method according to claim 4 wherein aligning the transverse position of the cutting blade (513) on the position of the edge detection device (8).
6. Procédé selon la revendication 5 dans lequel le dispositif de détection de front (8) est disposé transversalement à équidistance de la première (U) et de la seconde (L2) lisière.6. The method of claim 5 wherein the edge detection device (8) is disposed transversely equidistant from the first (U) and the second (L 2 ) edge.
7. Procédé selon l’une quelconque des revendications précédentes dans lequel, au cours des étapes D et E, on régule le déplacement transversal de la tête de coupe (51 ) en fonction du déplacement longitudinal du tapis de pose (2) et de l’angle (a) formé par les fils avec la direction longitudinale (XX’). 7. Method according to any one of the preceding claims wherein, during steps D and E, the transverse displacement of the cutting head (51) is regulated as a function of the longitudinal displacement of the laying mat (2) and the angle (a) formed by the yarns with the longitudinal direction (XX ').
8. Procédé selon la revendication 7, dans lequel la lame de coupe (513) est mobile librement selon une direction transversale par rapport à la tête de coupe (51 ).  8. The method of claim 7, wherein the cutting blade (513) is freely movable in a direction transverse to the cutting head (51).
9. Procédé selon la revendication 7 et la revendication 8, dans lequel, à l’aide d’un moyen d’évaluation de la position transversale de la lame de coupe par rapport à la tête de coupe (516), on ajuste le déplacement transversal de la tête de coupe (51 ) de sorte que la position transversale de la lame de coupe (513) par rapport à la tête de coupe (51 ) reste dans des limites prédéterminées (d).  The method of claim 7 and claim 8, wherein, using a means for evaluating the transverse position of the cutting blade with respect to the cutting head (516), the displacement is adjusted. crosswise of the cutting head (51) so that the transverse position of the cutting blade (513) with respect to the cutting head (51) remains within predetermined limits (d).
10. Procédé selon l’une quelconque des revendications précédentes, dans lequel, au cours des étapes A, D, E et F, on fait circuler la nappe de renfort (P) successivement sur un tapis de centrage (3) et sur un tapis de pose (2) disposés en amont de la forme cylindrique (1 ).  10. A method according to any one of the preceding claims, wherein, during the steps A, D, E and F, is made to circulate the reinforcing ply (P) successively on a centering mat (3) and on a mat laying (2) arranged upstream of the cylindrical shape (1).
1 1 . Procédé selon la revendication 10 dans lequel le tapis de centrage (3) est mobile en rotation autour d’un axe (XX’) perpendiculaire au plan du tapis de centrage sur lequel circule la nappe et dans lequel, à l’aide de caméras (31 ) détectant la position des lisières (U , L2) de la nappe, on régule la position angulaire du tapis de centrage de manière à aligner la nappe (P) sur une position transversale prédéfinie. 1 1. A method according to claim 10 wherein the centering belt (3) is rotatable about an axis (XX ') perpendicular to the plane of the centering belt on which the lap and in which, using cameras ( 31) detecting the position of the selvedges (U, L 2 ) of the web, the angular position of the centering belt is adjusted so as to align the web (P) with a predefined transverse position.
12. Procédé selon la revendication 11 , dans lequel les fils (W) de la nappe sont des fils métalliques, et dans lequel le tapis de centrage (3) et le tapis de pose (2) sont munis d’un dispositif magnétique pour faire adhérer la nappe (P) sur lesdits tapis (2, 3). 12. The method of claim 11, wherein the son (W) of the sheet are metal son, and wherein the centering mat (3) and the laying mat (2) are provided with a magnetic device for adhering the web (P) to said mats (2, 3).
13. Procédé selon l’une quelconque des revendications 10 à 12, dans lequel les plans du tapis de pose (2) et du tapis de centrage (3) sur lesquels circule la nappe (P) font entre eux un angle non nul (a).  13. Method according to any one of claims 10 to 12, wherein the planes of the laying belt (2) and the centering belt (3) on which the web (P) circulates between them a non-zero angle (a ).
14. Procédé selon la revendication 13, dans lequel une force motrice fournie à la nappe par le tapis de centrage (3) est inférieure ou égale à la moitié d’une force motrice fournie à la nappe par le tapis de pose (2). 14. The method of claim 13, wherein a driving force supplied to the web by the centering belt (3) is less than or equal to half of a driving force supplied to the web by the laying mat (2).
15. Procédé selon l’une quelconque des revendications 10 à 14, dans lequel on ajuste la vitesse longitudinale du tapis de pose (2) et du tapis de centrage (3), par rapport à la vitesse de rotation de la forme cylindrique (1 ) de sorte que la tension de pose de la nappe sur la forme cylindrique (1 ) est égale à une valeur prédéterminée.  15. A method according to any one of claims 10 to 14, wherein the longitudinal speed of the laying belt (2) and the centering belt (3) is adjusted with respect to the speed of rotation of the cylindrical shape (1). ) so that the laying tension of the web on the cylindrical shape (1) is equal to a predetermined value.
16. Procédé selon l’une quelconque des revendications précédentes, dans lequel, à l’étape G, on détache le front arrière (PR) de la nappe à l’aide d’un outillage manuel.  16. A method according to any one of the preceding claims, wherein, in step G, is detached the rear edge (PR) of the web using a manual tooling.
17. Procédé selon l’une quelconque des revendications 1 à 16, dans lequel la forme cylindrique (1 ) est formée de secteurs mobiles radialement.  17. Method according to any one of claims 1 to 16, wherein the cylindrical shape (1) is formed of radially movable sectors.
18. Procédé selon l’une quelconque des revendications 1 à 16, dans lequel la forme cylindrique (1 ) est le sommet d’une ébauche torique de pneumatique.  18. A method according to any one of claims 1 to 16, wherein the cylindrical shape (1) is the apex of a tire tire blank.
EP18822036.2A 2017-12-19 2018-12-12 Method for placing a reinforcing ply on a large dimension drum Active EP3727825B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1762403 2017-12-19
PCT/EP2018/084600 WO2019121254A1 (en) 2017-12-19 2018-12-12 Method for placing a reinforcing ply on a large dimension drum

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EP3727825A1 true EP3727825A1 (en) 2020-10-28
EP3727825B1 EP3727825B1 (en) 2021-10-20

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EP18822036.2A Active EP3727825B1 (en) 2017-12-19 2018-12-12 Method for placing a reinforcing ply on a large dimension drum

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US (1) US11602912B2 (en)
EP (1) EP3727825B1 (en)
BR (1) BR112020012051B1 (en)
WO (1) WO2019121254A1 (en)

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Publication number Priority date Publication date Assignee Title
NL2024050B1 (en) * 2019-10-18 2021-06-22 Vmi Holland Bv Method and apparatus for correcting a feeding distance of a strip for cutting

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1144912B (en) 1958-08-27 1963-03-07 Continental Gummi Werke Ag Device on winding drums of tire winding machines, tape making machines or the like for pressing on and cutting off cord fabric webs
CH420597A (en) * 1964-03-26 1966-09-15 Firestone Prod Device for separating fabric or film webs for the manufacture of vehicle tires
US4824515A (en) 1983-05-09 1989-04-25 The Firestone Tire & Rubber Company Ply applicator
JPH03286846A (en) 1990-04-02 1991-12-17 Sumitomo Rubber Ind Ltd Attaching device for tire component
JP3134181B2 (en) * 1995-09-22 2001-02-13 横浜ゴム株式会社 Method and apparatus for cutting rubber sheet material with metal reinforcement cord
JP4162887B2 (en) * 2001-12-13 2008-10-08 横浜ゴム株式会社 Cutting method of wire sheet containing rubber cord and cutting blade used for the cutting
NL1025764C2 (en) 2004-03-18 2005-09-20 Vmi Epe Holland Cutting device for cutting belt layer from unvulcanized rubber, controls actuator to control sideward movement of blade, when detected sideward movement of blade is more than preset value
CN103596750B (en) * 2011-04-12 2017-08-25 哈布尔格-弗罗伊登贝格尔机械工程有限公司 Method and apparatus for the orientation of band casing ply
JP6683026B2 (en) 2016-06-09 2020-04-15 住友ゴム工業株式会社 Rubber sheet cutting method and rubber sheet cutting device
JP6809026B2 (en) * 2016-08-08 2021-01-06 横浜ゴム株式会社 Cutting method and equipment for corded rubber sheet members

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BR112020012051B1 (en) 2023-04-04
WO2019121254A1 (en) 2019-06-27
BR112020012051A2 (en) 2020-11-24
US11602912B2 (en) 2023-03-14
US20200391464A1 (en) 2020-12-17
EP3727825B1 (en) 2021-10-20

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